数据库系统的核心是
A.编译系统
B.数据库
C.操作系统
D.数据库管理系统
参考答案:D
解析: 数据库系统有数据库、数据库管理系统和用户组成。其核心是数据库管理系统。
The federal government seeks ways to increase the total investment component of GDP. In response to the government’s objective, economist Scan Zadora recommends that the federal government lower taxes on interest earned on savings accounts. Zadora’s colleague, Timothy Smythe, recommends that the federal government reduce its budget deficit. Regarding the statements made by Zadora and Smythe: Zadora Smythe()①A. CorrectIncorrect ②B. CorrectCorrect ③C. Incorrect Ineorrect
A. ①
B. ②
C. ③
国家地理频道是美国著名的科普电视台,其缩写是()
A、NGC
B、C、NN
C、A、B、C
D、NB、C